Fuel feed pump for internal-combustion engines



Jan. 30, 1945.

Original Filed Nov. 25, 1939 N m l llllllhh 3 $3 29 INVENTOR.

' RomeoM/Vardome A Tram/5y Patented Jan. 30, 1945 FUEL FEED PUMP FOR. INTERNAL- COMBUSTION ENGINES Romeo M. Nardone, Westwood, N. J., assignor to Bendix Aviation Corporation, South Bend, Ind., a corporation of Delaware Original application November 25, 1939, Serial No.-306,158. Divided and this application November 22, 1940, Serial No. 366,748

1 Claim.

This invention relates'to internal combustion engines, and particularly to the delivery of fuel thereto, and the combustion thereof.

This application is a division of my application No. 306,158., filed November 25, 1939, now Patent No. 2,243,645 granted May 27, 1941.

An object of the invention is to improve the fuel' pumping mechanism for delivery of fuel to the engine.

Another object is to provide novel control means for regulating the fuel delivery.

Further objects will become apparent from inspection of the following specification when read with reference to the accompanying drawing wherein is illustrated the preferred embodiment of the invention. It is to be expressly understood, however, that the drawing is for the purpose of illustration only, and is not designed as a definition of the limits of th invention, reference being had to the appended claim for this purpose.

In the drawing, the single view illustrates a longitudinal section of the fuel pump.

As illustrated in the drawing, the fuel pump 28 has incorporated therein a spring IN and a diaphragm I02, the delivery stroke of the pump being produced by the spring acting on one side of the diaphragm to expel liquid fuel from the pump chamber I03. The pump is equipped with camoperated linkage 3|, I05, I06 and I'I which moves the diaphragm against the action ofthe spring IM to energize said spring and produce asuction stroke by which additional liquid fuel is brought into the chamber I03, by way of inlet passages I08 and I09, perforated valve II I (having the usual pressure responsive cover adapted to openexpelled past a similarly constructed perforated outlet valve I I3 and a second ported member I I4 enters outlet chamber II6 with which novel elements, now to be described, are associated.

'Io impart initial head to the liquid fuel supply, chamber I I6 is provided with a "priming" plunger Ill having a flange H8 at its base to receive a bellows element H9, and a neck portion I2I to receive a manually operable knob or head I22. A pin I23 extends through the neck I2I to receive a rod I24 whose lower end is engageable with the upper extremity of the diaphragm assembly to cause downward movement of the said assembly. Spring I26 abuts a fixed plate I 21 at one end, and bears upon plunger I I! at its upper end to return the plunger to the position shown after each priming stroke. If the priming action should proceed long enough to create more pressure thanfuel through passage I08'wi1l cease, until suchtime as the pressure is relieved by way of carbureter supply line 69, due to the starting of the engine. Bellows H9 serves to seal the unit against the possibility of escape of fluid by any path other than the normal outlet 69.

I What is claimed is:

In a fuel pump for an internal combustion engine, the combination with an outlet chambenof a pump chamber, a diaphragm therein, and a manually operable diaphragm-engaging plunger passing through said outlet chamber, and means movable with said plunger 'to seal the 'outlet chamber against leakage past said plunger.

ROMEO M. NARDONE. 

